locals { # if we are in a single cluster config, we use the default klipper lb instead of Hetzner LB is_single_node_cluster = sum(concat([for v in var.control_plane_nodepools : v.count], [0])) + sum(concat([for v in var.agent_nodepools : v.count], [0])) == 1 ssh_public_key = trimspace(file(var.public_key)) # ssh_private_key is either the contents of var.private_key or null to use a ssh agent. ssh_private_key = var.private_key == null ? null : trimspace(file(var.private_key)) # ssh_identity is not set if the private key is passed directly, but if ssh agent is used, the public key tells ssh agent which private key to use. # For terraforms provisioner.connection.agent_identity, we need the public key as a string. ssh_identity = var.private_key == null ? local.ssh_public_key : null # ssh_identity_file is used for ssh "-i" flag, its the private key if that is set, or a public key file # if an ssh agent is used. ssh_identity_file = var.private_key == null ? var.public_key : var.private_key # shared flags for ssh to ignore host keys, to use root and our ssh identity file for all connections during provisioning. ssh_args = "-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ${local.ssh_identity_file}" ccm_version = var.hetzner_ccm_version != null ? var.hetzner_ccm_version : data.github_release.hetzner_ccm.release_tag csi_version = var.hetzner_csi_version != null ? var.hetzner_csi_version : data.github_release.hetzner_csi.release_tag kured_version = data.github_release.kured.release_tag # The following IPs are important to be whitelisted because they communicate with Hetzner services and enable the CCM and CSI to work properly. # Source https://github.com/hetznercloud/csi-driver/issues/204#issuecomment-848625566 hetzner_metadata_service_ipv4 = "169.254.169.254/32" hetzner_cloud_api_ipv4 = "213.239.246.1/32" whitelisted_ips = [ local.network_ipv4_cidr, local.hetzner_metadata_service_ipv4, local.hetzner_cloud_api_ipv4, "127.0.0.1/32", ] base_firewall_rules = concat([ # Allowing internal cluster traffic and Hetzner metadata service and cloud API IPs { direction = "in" protocol = "tcp" port = "any" source_ips = local.whitelisted_ips }, { direction = "in" protocol = "udp" port = "any" source_ips = local.whitelisted_ips }, { direction = "in" protocol = "icmp" source_ips = local.whitelisted_ips }, # Allow all traffic to the kube api server { direction = "in" protocol = "tcp" port = "6443" source_ips = [ "0.0.0.0/0" ] }, # Allow all traffic to the ssh port { direction = "in" protocol = "tcp" port = "22" source_ips = [ "0.0.0.0/0" ] }, # Allow ping on ipv4 { direction = "in" protocol = "icmp" source_ips = [ "0.0.0.0/0" ] }, # Allow basic out traffic # ICMP to ping outside services { direction = "out" protocol = "icmp" destination_ips = [ "0.0.0.0/0" ] }, # DNS { direction = "out" protocol = "tcp" port = "53" destination_ips = [ "0.0.0.0/0" ] }, { direction = "out" protocol = "udp" port = "53" destination_ips = [ "0.0.0.0/0" ] }, # HTTP(s) { direction = "out" protocol = "tcp" port = "80" destination_ips = [ "0.0.0.0/0" ] }, { direction = "out" protocol = "tcp" port = "443" destination_ips = [ "0.0.0.0/0" ] }, #NTP { direction = "out" protocol = "udp" port = "123" destination_ips = [ "0.0.0.0/0" ] } ], !local.is_single_node_cluster ? [] : [ # Allow incoming web traffic for single node clusters, because we are using k3s servicelb there, # not an external load-balancer. { direction = "in" protocol = "tcp" port = "80" source_ips = [ "0.0.0.0/0" ] }, { direction = "in" protocol = "tcp" port = "443" source_ips = [ "0.0.0.0/0" ] } ]) common_commands_install_k3s = [ "set -ex", # prepare the k3s config directory "mkdir -p /etc/rancher/k3s", # move the config file into place "mv /tmp/config.yaml /etc/rancher/k3s/config.yaml", # if the server has already been initialized just stop here "[ -e /etc/rancher/k3s/k3s.yaml ] && exit 0", ] apply_k3s_selinux = ["/sbin/semodule -v -i /usr/share/selinux/packages/k3s.pp"] install_k3s_server = concat(local.common_commands_install_k3s, ["curl -sfL https://get.k3s.io | INSTALL_K3S_SKIP_START=true INSTALL_K3S_SKIP_SELINUX_RPM=true INSTALL_K3S_CHANNEL=${var.initial_k3s_channel} INSTALL_K3S_EXEC=server sh -"], local.apply_k3s_selinux) install_k3s_agent = concat(local.common_commands_install_k3s, ["curl -sfL https://get.k3s.io | INSTALL_K3S_SKIP_START=true INSTALL_K3S_SKIP_SELINUX_RPM=true INSTALL_K3S_CHANNEL=${var.initial_k3s_channel} INSTALL_K3S_EXEC=agent sh -"], local.apply_k3s_selinux) control_plane_nodepools = merge([ for pool_index, nodepool_obj in var.control_plane_nodepools : { for node_index in range(nodepool_obj.count) : format("%s-%s-%s", pool_index, node_index, nodepool_obj.name) => { nodepool_name : nodepool_obj.name, server_type : nodepool_obj.server_type, location : nodepool_obj.location, labels : concat(local.default_control_plane_labels, nodepool_obj.labels), taints : concat(local.default_control_plane_taints, nodepool_obj.taints), index : node_index } } ]...) agent_nodepools = merge([ for pool_index, nodepool_obj in var.agent_nodepools : { for node_index in range(nodepool_obj.count) : format("%s-%s-%s", pool_index, node_index, nodepool_obj.name) => { nodepool_name : nodepool_obj.name, server_type : nodepool_obj.server_type, location : nodepool_obj.location, labels : concat(local.default_agent_labels, nodepool_obj.labels), taints : nodepool_obj.taints, index : node_index } } ]...) # The main network cidr that all subnets will be created upon network_ipv4_cidr = "10.0.0.0/8" # The first two subnets are respectively the default subnet 10.0.0.0/16 use for potientially anything and 10.1.0.0/16 used for control plane nodes. # the rest of the subnets are for agent nodes in each nodepools. network_ipv4_subnets = [for index in range(length(var.control_plane_nodepools) + length(var.agent_nodepools) + 1) : cidrsubnet(local.network_ipv4_cidr, 8, index)] # disable k3s extras disable_extras = concat(["local-storage"], local.is_single_node_cluster ? [] : ["servicelb"], var.traefik_enabled ? [] : ["traefik"], var.metrics_server_enabled ? [] : ["metrics-server"]) # Default k3s node labels default_agent_labels = concat([], var.automatically_upgrade_k3s ? ["k3s_upgrade=true"] : []) default_control_plane_labels = concat([], var.automatically_upgrade_k3s ? ["k3s_upgrade=true"] : []) allow_scheduling_on_control_plane = local.is_single_node_cluster ? true : var.allow_scheduling_on_control_plane # Default k3s node taints default_control_plane_taints = concat([], local.allow_scheduling_on_control_plane ? [] : ["node-role.kubernetes.io/master:NoSchedule"]) }